Valve seat grinding implement



Jun 4, 1940. s.. H. HAAS VALVE SEAT GRINDING- IMPLEMENT Filed June 9, 1939 I 2 4 //1 /5 i 70/Q/ Patented June 4,1940 v I 2,203,143

UNITED STATES PATENT OFFICE 2,203,143 VALVE SEAT GRINDING IMPLEMENT Samuel H. Haas, Los Angeles, Calif. Application June 9, 1939, Serial No. 278,231 6 Claims. (01.51-241) My invention relates generally togrinding deof the driving washer utilized between the osvices and more particularly to the particular type cillating stem of the implement and the grinding of tool or instrument designed for grinding the wheel, also showing the upper portion of the valve seats of internal combustion engines and grinding wheel.

forming the subject matter of my co-pending Referring by numerals to the accompany draw- 5 application for U. S, Letters Patent, filed Febing which illustrates a preferred embodiment of ruary 23, 1939,,Serial No. 257,807. my. invention, I0 designates the body of a con- The principal objects of my invention are, to ventional fluid pressure actuated motor of the generally improve upon the construction of the type that imparts oscillating rotary motion to 10. valve seat grinding implement disclosed in my its shaft II and, detachably connected to the aforesaid co-pending patent application, as well lower end of shaft II is the upper portion of a as other forms of similar tools, to provide imlink I2 comprising a fla p t having-its lower proved means for effecting a positive driving conportion i3 bent a quarter turn so that it occunection between the stem of the implement and pies a position at right angles to the upper 5 the grinding wheel and further, to provide an porti n o Said p automatic expansion ball bearing for that por- The lower portions I3 of this link is detachably tion of the stem of the implement that extends connected in any suitable manner to the upper into the fixed guide and bearing that is formed end of a stem l4 that carries the grinding wheel. integral with the cylinder block below the valve The construction just described and which is seat and, which receives the depending stem of fully described in my above mentioned co-pen-d- 20 the valve that controls the part that is surroundi s p nt pp a ion f nctions as a universal ed by said stem. joint between the driving shaft I! and stem I4 .By providing an automatic expansion bearing seats to enable the motor and its shaft to funcfor the stem of the implement, said stem will tion properly in driving stern M, even though during operation oscillate on a fixed axis and the axes of the stem and shaft are not indirect 25 have a firm and substantial bearing in the bore longitudinal alignment A D ti 0f the Stem 1 of the valve stem guide, even though said bore a Short distahoe below itS pp d s may be somewhat larger in diameter than the ternally t a d s d ed y 5 and, a diameter of the. stem of the grinding implement. sho t portion is of S Stem just below this A further object of my invention is, to provide threaded portion is formed square or non-circu- 30' a valve seat grinder that is especially applicable lar in cross section in order to receive and hold for use in'connection with fluid pressure operagainst rot t a driVihg Washer ated motors that impart oscillating rotary mo- This d v s e s in the form of a metal tion to a shaft or other member to which the disc provid d with a t a ly ar an d aperture stem of the valve seat grinding implement is de- 8 h p so as to receive the u r p rtachably connected. tion [6 of the stem, thus providing a positive With the foregoing and other objects in view, driving ngagement between the stem and washmy invention consists in certain novel features er a d, p ti s of the Washer around the openof construction and arrangement of parts that. ing therein are indented or pressed downwardly 40 will be hereinafter more fully described and to form d p Studs 9. These studs are 40:

claimed and illustrated in the accompanying d p d to enter corresponding r ss s or dedrawing in which: pressions 20 that are formed in the upper sur- Fig. l is aside elevational view of a grinding face of the grinding Wheel 2|. the latter being implement constructed in accordance with my inof the conventional type and p e e y formed vention and showing the same in position to grind of pulverized abrasive material d aving on 4.5

a al at. its lower portion an inclined or beveled face 22 Fig.- 2 is an elevational view of the grinding that e g es and grinds the valve seat.

- implement with parts thereofin vertical section. Grin-ding wheel 2| is provided with an axially Fig. 3 is a horizontal section taken on theline disposed aperture 23 that receives an enlarged 33 of Fig.2. portion 24 of stem Hi just below the non-circu- 50; Fig. 4 is'an enlarged vertical section taken on lar portion l6 and, the under face of the grindthe line 4-4 of Fig. 2. ing wheel rests on a flange .25 that is formed on Fig. 5 is a horizontal section taken on the line' the stem just below the enlarged portion 24. 55 of Fig. 4. After the grinding wheel has been positioned Fig. 6 is a perspective view of a modified form on the'stem and the driving Washer I! positioned 55.;

on top of the grinding wheel with the studs l9 positioned in the recesses 20, a washer 26 is psitioned on the stem and bears directly on top of the driving washer and a nut 21 is tightly screwed onto the threaded portion l of the stem to firmly maintain the grinding wheel and the driving washer in position on the stem.

A modified form of the driving washer is illustrated in Fig. 6 and, in this construction a driving engagement between said washer and the grinding wheel is effected by means of short fingers 28 that are formed integral with and depend from the edge of the washer and, which fingers enter recesses 29 that are formed in the top of the grinding wheel when the parts are assembled for use.

Formed in the lower portion of the stem I4 is an axial bore 30, the lower portion of which is threaded for the reception of a short threaded plug 3! and, the latter being provided in its lower end with a slot 32 for the reception of the point of a screw driver or like implement. Resting on the upper end of the plug 3| is the lower end of an expansive coil spring 33, the upper end thereof bearing against the lower end of a plunger 34 that is adapted to slide freely in the upper portion of the bore 3|] and, the upper end of this plunger is cone-shaped as designated by 35.

Formed through the wall of the stem surrounding the upper portion of the bore 30 are apertures 36 and, loosely arranged in each of these apertures is a small ball 31 of hard metal. These balls are normally forced outwardly by the coneshaped upper end 35 ofplunger 34, which latter tends to move upwardly under the pressure exerted by spring 33 and, the outward movement of these balls is limited by retaining lips 38 that are formed around the outer ends of the apertures 36.

As a result of the construction just described, the balls 3'! function as an expanding anti-friction bearing between the lower portion of the stem l4 and the valve stem guide in which said stem is positioned while the grinding implement is in service and thus, the lower portion of the stem is maintained for oscillating rotary motion on a fixed or definite axis, even-though the opening in the valve stem guide is larger in diameter than the diameter of the stem of the grinding implement. In addition, the balls carried by the lower portion of the stem provide an effective expanding anti-friction bearing between the stem and the fixed valve stem guide.

In the use of my improved valve seat grinding implement, the lower portion of the stem M which functions as a pilot is inserted downwardly into the valve stem bearing in the cylinder block and the implement is moved downward until the inclined face 22 of the grinding wheel engages the inclined seat of the valve.

Motor ID in operation imparts oscillating rotary Inasmuch as the driving washer I1 is locatedon the upper portion of the stem of the implethe implement and with the driving washer that is carried thereby.

Thus it will be seen that I have provided a valve seat grinding implement that is relatively simple in construction, inexpensive of manufacture and very effective in performing the functions for which it is intended.

It will be understood that minor changes in the size, form and construction of the various parts of my improved valve seat grinding implement, may be made and substituted for those herein shown and described, without departing from the spirit of my invention, the scope of which is set forth in the appended claims.

I claim as my invention:

1. In a valve seat grinding implement, a stem provided with a shoulder and with a non circular portion located above said shoulder, a grinding wheel positioned on said stem and resting on said shoulder, there being depressions formed in the top of said grinding wheel, a driving washer provided with a non-circular aperture for the reception of the non-circular portion of said stem, members depending from said driving washer for engagement in the depressions in the top of the grinding wheel and means on the stem for looking the driving washer to the grinding wheel and for locking said grinding wheel against said shoulder.

2. In a valve seat grinding implement, a stem, a grinding wheel removably mounted on the upper portion of said stem, a driving washer arranged above said grinding wheel and having drivingengagement with said stem, said washer having driving engagement with said grinding wheel and an expansive anti-friction bearing arranged in the lower portion of said stem for engaging the valve stem guide and bearing in which the lower portion of said stem is positioned.

3. In a valve seat grinding implement, a stem, a grinding wheel removably mounted on the upper portion of said stem, a plurality of apertures formed in the lower portion of said stem, balls loosely arranged in said apertures and spring pressed means forengaging and tending to move said balls outwardly in said openings.

4. In a valve seat grinding implement, a stem, a grinding wheel removably mounted on the upper portion of said stem, a plurality of apertures formed in the lower portion of said stem, balls loosely arranged in said apertures, a plunger arranged for sliding movement in the lower portion of said stem for engaging said balls and. tending to move the same outwardly and a spring for exerting upward pressure against said plunger.

5. In a valve seat grinding implement the combination with a stem, of a grinding wheel re:- movably mounted on the upper portion of'said stem, a driving washer disposed above said grinding wheel and having driving engagement with said stem, said washer having driving. engagement with .said grinding wheel and anti-friction stem and anti-friction bearings carried by the lower portion of said stem for engaging the valve stem guide and bearing in which the lower portion of said stem is positioned While the device is in use.

SAMUEL H. HAAS. 

